which one of this screeing guidelines is correct, please advise

Colon cancer screening from Kaplan videos:
- everyone above age of 50 gets a colonoscopy
- single family member with history of colon cancer - then start colonoscopy at 40 years of age and done every 10 years or done 10 years earlier than the family member
- if 3 family members with colon cancer - start screening at 25 years of age every 1-2 years

but i have looked at medscape for latest update, and it says

-Pt with 1st degree relative with advanced adenoma or colon cancer diagnosed above th age of > 60 years - -- colonoscopy every 10 years begining at 50 years
- Pt with 1st degree relative with advanced adenoma or colon cancer diagnosed at age < 60 years --- colonoscopy every 5 years begining at age 40 or 10 years younger than age at diagnosis of youngest affected relative
(criteria for advance adenoma being - >1cm in size, highgrade dysplasia, and villous component.0
- 2 or more 1st degree relative with colon cancer or high risk adenomas ---- Colonoscopy every 5 years beginig at age 40 or 10 years younger than age of diagnosis of youngest relative.

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